Yoshiya Kasahara

Comparative Analysis of Ion and Electron Contributions to Ionospheric Ionization at Auroral and Subauroral Latitudes

Abstract Electron and proton precipitation into the nightside ionosphere is a key process in magnetosphere–ionosphere coupling. Although auroral electron precipitation at –10 keV is traditionally considered the main driver of auroral emissions, recent studies show that keV electr...

Data‐Driven Wave Distribution Function Method Based on Generalization Error Minimization

Abstract Accurately estimating the propagation direction of plasma waves is essential for preserving space infrastructure, as it provides insight into the global spatial distribution of plasma in geospace. This study proposes an improved wave distribution function (WDF) estimatio...